Apparatus for and method of testing dynamic characteristics of components of vehicle

Abstract

Measured values obtained from a running test of an object to be tested and a module on a test bench such as a flat belt type chassis dynamo, and computation based upon numerical models of components other than the object to be tested and the module, are related to each other so as to reproduce a condition near to an actual running condition, for the object to be tested and the module so as to precisely analyze how the object to be tested and the module affects upon the motion of the overall vehicle during actual running of the vehicle. Thus it is possible to evaluate dynamic characteristics of respective vehicle components and a module which relate to the maneuvering performance of the vehicle, on a test bench in a condition in which a load variation and an alignment variation are taken into consideration.

Description

BACKGROUND OF THE INVENTIONThe present invention relates to an apparatus for and a method of testing-running characteristics of a part of a vehicle as an object to be tested on a test bench.Related ArtA flat belt type chassis dynamo has been proposed in order to evaluate the maneuvering stability of the vehicle, instead of a conventional drum type chassis dynamo. For example, Japanese Patent Unexamined Publication No. 6-249753 discloses a method wherein support parts are provided, corresponding to wheels of the vehicle, on the upper surfaces of movable parts which can be swung by first hydraulic jacks actuated independent from one another, and which can be swung widthwise of the vehicle by second hydraulic jacks actuated independent from one another, and flat belts making contact with the wheels of the vehicle are provided respectively to the support parts, the movable parts being inclined so as to reproduce a climbing slope and a ramp and the support parts being inclined so as to v...

AI Technical Summary

Benefits of technology

In a method of causing respective functional components of a vehicle, which relate to the maneuvering performance of a vehicle, as an object to be tested, to reproduce, on a test bench, a condition in consideration with variation in load and variation in alignment, which occur during actual running of a vehicle, it is required to subject a dummy chassis on which functional components and a module are installed, to an attitude change or a load variation by forces represented by an inertia force upon acceleration and a centrifugal force upon turning during actual running of a vehicle, and accordingly, it is also required to adjust these forces in accordance a load variation and an alignment variation resulting therefrom.

Thus, according to one aspect of the present invention, there is provided a vehicle component dynamic test apparatus for testing running characteristics of respective vehicle components relating to maneuvering performances of a vehicle, and a module on a test bench, comprising a frame, a dummy chassis supported by a plurality of actuators connected to the frame, for setting up thereon components including at least one wheel, a dummy road surface simulating a road surface on which the vehicle runs, reaction force measuring means for measuring a reaction force produced when the wheel among the components makes contact with the dummy road surface, an attitude measuring means for measuring an attitude of the dummy chassis with respect to the frame, control means for the actuators, control means for the du

Problems solved by technology

The variation in load and variation in the alignment intricately influence upon each other so as to excessively affect the friction forces between the tires and the road surfaces, and are influence factors which are not negligible for analyzing the maneuverability of the vehicle, in particular abrupt changes in m

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